US2540985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium derivatives of vinylpyridine-polyinylbenzene copolymers
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-12-06
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Granted: 1951-02-06
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Expires: 1969-12-06
Abstract
No abstract record available.
Inventors
- 👤 Elwood F Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:22
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A COMPOUND TAKEN FROM THE GROUP CONSISTING OF QUATERNARY AMMONIUM SALTS AND QUATERNARY AMMONIUM HYDROXIDES OF COPOLYMERS OF 100 PARTS OF VINYL PYRIDINE AND FROM 1 TO 20 PARTS OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF DIVINYL BENZENE AND TRIVINYL BENZENE.
References Cited (Backward Citations)
US2484420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |